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Rest assured, theyre not gone

If you just want that ability, Basri's Solidarity costs a lot less mana, and you can find more repeatable effects like some Ajani planeswalkers

Mime Psychic Rare Holo 7/64: Nidoqueen Grass Rare Holo 8/64: Pidgeot Colorless Rare Holo 9/64: Pinsir Grass Rare Holo 10/64: Scyther Grass Rare Holo 11/64: Snorlax Colorless Rare Holo 12/64: Vaporeon Water Rare Holo 13/64: Venomoth Grass Rare Holo 14/64: Victreebel Grass Rare Holo 15/64: Vileplume Grass Rare Holo 16/64: Wigglytuff Colorless Rare Holo 17/64: Clefable Colorless Rare 18/64: Electrode Lightning Rare 19/64: Flareon Fire Rare 20/64: Jolteon Lightning Rare 21/64: Kangaskhan Colorless Rare 22/64: Mr

It's intended to help expose a player to new playstyles or inspire them to build new Decks

If you cast a spell for which mana may be spent as though it were mana of any color, you may cast it for Leyline of Mutation's second ability's alternative cost and still spend mana as though it were mana of any color